DRY stone wallers are invited to pitch their talents against one another in a regional competition.
The Country Land and Business Association and the Yorkshire Dry Stone Walling Guild have teamed up to stage the Millennium Wall Competition.
Entries are sought from either wallers or owners for walls which were built in the two years up to June 2003.
Marks are awarded for style, landscape impact, tidiness and difficulty of the terrain.
The wall has to be at least 10 metres long and within the historic boundaries of Yorkshire.
A spokesman for the association said: "Dry stone walling's survival owes much to the realisation that only by being able to use traditional skills and materials can we ensure that Yorkshire's heritage will not be lost.
"A new generation of skilled craftsmen has emerged to supply an increasing demand from farmers and landowners and our contest stimulates that very positive trend."
Contact the CLA at Malt Shovel House, Spring Street, Easingwold, York, YO61 3BJ, e-mail claoffice@ clayork.demon.co.uk or ring 01347 823803.